Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 101,484	$ 91,971	$ 302,822	$ 290,695
Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	76,927	68,677	226,747	207,081
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,873	10,972	36,177	32,631
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,684	12,322	39,898	50,983
Product revenue - Distributors
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	82,969	73,273	257,716	218,923
Product revenue - Direct
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,963	14,096	33,619	44,283
Licensing and services revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,552	$ 4,602	$ 11,487	$ 27,489